JP6958520B2 - Coil parts - Google Patents

Description

The present invention relates to a coil component, and more particularly to a coil component having a structure in which two wires having twisted portions twisted to each other are wound around a winding core.

As a coil component of interest for the present invention, for example, there is a common mode choke coil described in Japanese Patent Application Laid-Open No. 2014-216525 (Patent Document 1). The common mode choke coil described in Patent Document 1 has a structure in which a twisted first wire and a second wire are wound around a winding core. According to Patent Document 1, when the first wire and the second wire are twisted together, the stray capacitance between the first wire and the second wire can be reduced, and the coil formed by the first wire can be reduced. It is stated that a decrease in the coupling coefficient between the wire and the coil formed by the second wire can be suppressed.

Japanese Unexamined Patent Publication No. 2014-216525

Patent Document 1 describes that the number of times the first wire and the second wire are twisted is 2 or more (see, for example, claim 3). However, this statement is extremely vague. Even if the number of times of twisting is 2 or more, it is unknown what length or number of times it is twisted. In Patent Document 1, there is no specific description beyond the above contents regarding the twisted state of the first wire and the second wire, that is, the twisted state.

In the case of wires used for small coil parts, the diameter of the linear center conductor is as thin as 0.02 mm or more and 0.080 mm or less, so the number of twists, that is, the number of twists, the more the wire breaks. The possibility of doing it increases. Therefore, in reality, the number of twists must be reduced to about several times per turn.

FIG. 11 shows the twisted state of the first wire W1 and the second wire W2 in an enlarged manner. In FIG. 11, the first wire W1 is shaded and the second wire W2 is shown in white so that the first wire W1 and the second wire W2 can be clearly distinguished. Although the twist direction of the S twist is shown in FIG. 11, the twist direction may be the opposite Z twist, or the Z twist and the S twist may be mixed. Further, in FIG. 11, the first wire W1 and the second wire W2 are shown to be in close contact with each other and twisted to each other, but there is a gap in a part of the first wire W1 and the second wire W2. It may be twisted together.

In FIG. 11, it is intended that the peripheral surface of the winding core exists on the other side of the paper surface. As shown in FIG. 11, in the twisted state of the first wire W1 and the second wire W2 when viewed from the outside of the peripheral surface of the winding core toward the central axis of the winding core, the first wire is in the range of length L. A twist of 360 degrees is given to the 1st wire W1 and the 2nd wire W2. At this time, the number of twists of the first wire W1 and the second wire W2 is 1 in the range of the length L. That is, the number of twists must be defined as the number of twists per unit length.

The twist pitch is also referred to as a twist pitch length, and is first from a specific relative position of the first wire W1 and the second wire W2 to the next same relative position in the twisted state of the first wire W1 and the second wire W2. Say the length to return to. Therefore, the above-mentioned length L is the twist pitch.

Further, in FIG. 11, in the range of the length L, the white second wire W2 is above the shaded first wire W1. Taking such a state as an example, when viewed from the outside of the peripheral surface of the winding core toward the central axis of the winding core, the point N where the first wire W1 and the second wire W2 intersect is a node. The point A at which the first wire W1 and the second wire W2 are most separated from each other is defined as the antinode.

When winding the first wire and the second wire around the winding core, a method of winding the first wire and the second wire while guiding them around the peripheral surface of the winding core in a pre-twisted state, or the first wire and There is a method of winding the first wire and the second wire while guiding them around the peripheral surface of the winding core while applying a twist to the second wire.

At this time, unless a special control is applied between the twisting operation and the winding operation, the first wire and the first wire appearing when viewed from the outside of the peripheral surface of the winding core toward the central axis of the winding core. The nodes and belly in the twisted part of the 2 wire take random positions for each turn and tend to be uneven. In particular, when the knot in the twist portion is located on the ridgeline of the winding core, the wire on the side away from the ridgeline is pulled toward the winding core, so that the shape of the twist is disturbed and the first wire and the first wire and the first wire are twisted. 2 The positions of the nodes and belly of the twisted part of the wire tend to be uneven.

Even if the positions of the nodes and belly of the twisted part are not aligned, if the number of twists is relatively large, the number of nodes and belly itself is also large, and the effect of one node and one belly is usually relative. However, as described above, when the number of twists is small, the effect of one node and one belly is relatively large. In any case, the misalignment of the twisted nodes and abdomen can cause the following problems.

First, the misalignment of the nodes and abdomen of the twisted portion impairs the stability of the wound and twisted states of the first and second wires. Specifically, the first wire and the second wire may be unwound from the winding core, or the twist may be biased. The instability of the wound and twisted states of the first and second wires contributes to the misalignment of the nodes and abdomen of the twisted portion.

Also, the misalignment of the nodes and abdomen of the twisted portion increases the possibility of impairing the electrical balance between the first wire and the second wire. More specifically, there can be a difference between the stray capacitance formed in relation to the first wire and the stray capacitance formed in relation to the second wire. In such a case, the inductance and capacitance affected by the signals passing through the first wire and the second wire are not equal to each other, and in the case of the common mode choke coil, this deteriorates the mode conversion characteristic. Can be the cause.

Therefore, an object of the present invention is to provide a coil component capable of improving the stability of the wound state and the twisted state of the first wire and the second wire.

The present invention, the peripheral surface is formed around the central axis, the peripheral surface comprises at least four planes arranged in the circumferential direction while extending and adjacent to each other in the direction along the central axis, the central axis in the plane At the first end in the circumferential direction, which is the circumferential direction, the first ridge line extending along the central axis is located, and the winding core and the spiral around the central axis of the winding core in the same direction and spiral. It is directed to a coil component comprising a first wire and a second wire, which are wound in a plurality of turns in a shape and form a twisted portion in a twisted state over a plurality of turns.

In order to solve the above-mentioned technical problems in such a coil component, in the present invention, the portion of the first ridge line is chamfered, whereby two convex portions are formed on the plane. The twisted portion located is characterized in that the first wire and the second wire are both brought into close contact with at least one of the two convex portions on the portion of the first ridgeline for one turn.

According to the present invention, on the peripheral surface of the winding core, the twisted portion located on the plane has the first wire and the second wire in close contact with at least one of the two convex portions on the first ridgeline portion. There is. In other words, when viewed from the outside of the peripheral surface of the winding core toward the central axis of the winding core , at least two convex portions whose antinodes in the twisted portions of the first wire and the second wire are in the portion of the first ridgeline. on the other hand it is in close contact with the. Therefore, even if the number of twists is small, the stability of the wound state and the twisted state of the first wire and the second wire can be improved as compared with the case where the node in the twisted portion is located on the ridgeline. Therefore, the stability of the electrical characteristics of the coil component can be improved.

In addition, since the antinode of the twisted portion is positioned by the ridgeline of the winding core, it is possible to reduce the unevenness of the positions of the nodes and the antinode of the twisted portion, and thus the electrical between the first wire and the second wire. The balance can be good. Therefore, the difference between the stray capacitance formed in relation to the first wire and the stray capacitance formed in relation to the second wire can be reduced, and the signals passing through the first wire and the second wire are affected, respectively. Inductance and capacitance can be equal to or almost equal to each other, and in the case of a common mode choke coil, the mode conversion characteristic can be reduced.

It is a front view of the coil component 1 which becomes the 1st reference example of this invention. It is a bottom view of the coil component 1 shown in FIG. It is a figure which showed the twist state of the 1st wire 4 and 2nd wire 5 provided in the coil component 1 shown in FIG. 1 in the cross section along the line III-III of FIG. It is a figure which shows typically the arrangement of the 1st wire 4 and 2nd wire 5 provided in the coil component 1 shown in FIG. 1 on the ridge line 11 of the winding core 2. It is a figure which shows typically the twist state of the 1st wire 4 and 2nd wire 5 in the coil component 1 shown in FIG. 1 in the state which developed the peripheral surface of winding core 2. It is sectional drawing of the winding core 2a provided in the coil component which becomes the 2nd reference example of this invention. It is sectional drawing of the winding core 2b provided in the coil component which becomes the 3rd reference example of this invention. It is sectional drawing of the winding core 2c provided in the coil component which becomes the 4th reference example of this invention. This is for explaining the first embodiment of the present invention, and corresponds to an enlarged drawing of the left half of the cross-sectional view shown in FIG. This is for explaining the second embodiment of the present invention, and corresponds to an enlarged drawing of the left half of the cross-sectional view shown in FIG. It is for demonstrating the twist pitch, the number of twists, the node and the antinode, and is the figure which shows the twist state of the 1st wire W1 and the 2nd wire W2 in an enlarged manner.

A coil component 1 as a first reference example of the present invention will be described with reference to FIGS. 1 to 5. The illustrated coil component 1 constitutes, for example, a common mode choke coil.

The coil component 1 includes a drum-shaped core 3 having a winding core 2. Further, the coil component 1 includes a first wire 4 and a second wire 5 arranged around the winding core 2. In FIGS. 1 to 4, the first wire 4 is shaded so that the first wire 4 and the second wire 5 can be clearly distinguished.

The drum-shaped core 3 is made of a non-conductive material, more specifically, a non-magnetic material such as alumina, a magnetic material such as Ni—Zn-based ferrite, or a resin. When the drum-shaped core 3 is made of resin, for example, it does not contain a resin containing magnetic powder such as metal powder or ferrite powder, a resin containing non-magnetic powder such as silica powder, or a filler such as powder. Consists of resin.

As the cross section of the wires 4 and 5 is shown in FIG. 4, the wires 4a and 5a are linear central conductors 4a and 5a made of copper wire having a diameter of 0.02 mm or more and 0.080 mm or less, respectively, and the central conductors 4a. And 5a are coated with coatings 4b and 5b made of an electrically insulating resin such as polyurethane, imide-modified polyurethane, polyesterimide or polyamideimide.

The winding core 2 has a peripheral surface formed around the central axis CA. As can be seen from FIG. 3, the winding core 2 has a rectangular cross-sectional shape along a plane orthogonal to the central axis CA. Therefore, the peripheral surface of the winding core 2 has four planes extending in the direction along the central axis CA, that is, the top surface 7 and the bottom surface 8 facing each other, and the top surface 7 and the bottom surface 8 adjacent to each other and facing each other. It has one side surface 9 and a second side surface 10.

The dimensions of each part measured in the circumferential direction of the winding core 2 are, for example, about 0.6 mm for the first side surface 9 and the second side surface 10, about 1.2 mm for the top surface 7 and the bottom surface 8, and about 3. It is 6 mm. Further, the dimension in the length direction measured in the extending direction of the central axis CA of the winding core 2 is, for example, about 2.0 mm.

The space between the top surface 7 and the first side surface 9 described above is referred to as a first ridge line 11, and the space between the top surface 7 and the second side surface 10 is referred to as a second ridge line 12. Further, the space between the bottom surface 8 and the first side surface 9 is referred to as a third ridge line 13, and the space between the bottom surface 8 and the second side surface 10 is referred to as a fourth ridge line 14. As shown in FIG. 3, it is preferable that the ridge lines 11 to 14 are chamfered to round the corners.

As shown in FIGS. 1 and 2, the drum-shaped core 3 has a first flange portion 15 and a first flange portion 15 and a second end portion connected to the first end portion and the second end portion opposite to each other in the central axis CA direction of the winding core 2, respectively. It has two collars 16. The first flange portion 15 is provided with the first terminal electrode 17 and the third terminal electrode 19, and the second flange portion 16 is provided with the second terminal electrode 18 and the fourth terminal electrode 20.

The terminal electrodes 17 to 20 are formed on the flange portions 15 and 16 facing the same direction as the bottom surface 8 of the winding core 2, as is often shown in FIG. 1 for the first terminal electrode 17 and the second terminal electrode 18. The bottom electrode portions 17a to 20a provided along the sides and the end face electrode portions 17b to 20b provided along the outer end faces of the flange portions 15 and 16 are provided. The bottom electrode portions 17a to 20a are formed, for example, by baking a conductive paste containing Ag. The end face electrode portions 17b to 20b are formed by, for example, sputtering NiCr and then sputtering NiCu after the bottom electrode portions 17a to 20a are formed. Further, after the bottom surface electrode portions 17a to 20a and the end face electrode portions 17b to 20b are formed, for example, Cu, Ni and Sn are formed so as to cover the bottom surface electrode portions 17a to 20a and the end face electrode portions 17b to 20b in a series. Each plating is applied in sequence.

The terminal electrodes 17 to 20 are formed by joining metal terminals obtained by processing a metal plate made of a metal material such as phosphor bronze, oxygen-free copper, and tough pitch copper to the flange portions 15 and 16 of the drum-shaped core 3. May be done.

Each end of the first wire 4 is connected to the first terminal electrode 17 and the second terminal electrode 18, respectively, and each end of the second wire 5 is connected to the third terminal electrode 19 and the fourth terminal electrode 20, respectively. Connected to. For example, thermocompression bonding or laser welding is applied to these connections.

The coil component 1 may further include a plate-shaped core 21. The plate-shaped core 21 is adhered to the drum-shaped core 3. Like the drum-shaped core 3, the plate-shaped core 21 is made of, for example, a non-magnetic material such as alumina, a magnetic material such as Ni—Zn-based ferrite, or a resin. When the plate-shaped core 21 is made of resin, for example, it does not contain a resin containing magnetic powder such as metal powder or ferrite powder, a resin containing non-magnetic powder such as silica powder, or a filler such as powder. Consists of resin. When the drum-shaped core 3 and the plate-shaped core 21 are made of a magnetic material, the drum-shaped core 3 is formed by providing the plate-shaped core 21 so as to connect between the first and second flange portions 15 and 16. A closed magnetic path is formed in cooperation with the shape core 21. The direction along the central axis CA is the length direction, and the direction perpendicular to the center axis CA and where the plate-shaped core 21 and the flanges 15 and 16 abut is perpendicular to the thickness direction, the length direction, and the thickness direction. Is defined as the width direction, the plate-shaped core 21 has, for example, a length direction dimension of about 3.2 mm, a width direction dimension of about 2.5 mm, and a thickness direction dimension of about 0.7 mm.

Most of the first wire 4 and the second wire 5 are in a twisted state in which most of them are twisted with each other except for the end portion connected to the terminal electrodes 17 to 20 and the vicinity thereof described above. When winding the first wire 4 and the second wire 5 having such a twisted portion around the winding core 2, the first wire 4 and the second wire 5 are twisted, or the first wire 4 and the second wire 5 and the first wire 4 and the second wire 5 are twisted. After the second wire 5 is twisted in advance, the first wire 4 and the second wire 5 are wound around the central axis CA of the winding core 2 in the same direction and spirally for a plurality of turns. As a result, the first wire 4 and the second wire 5 form a twisted portion over a plurality of turns. As described above, the first wire 4 and the second wire 5 are insulated and coated, so that they are not electrically connected to each other.

FIG. 4 schematically shows the arrangement of the first wire 4 and the second wire 5 on the ridge line 11. FIG. 4 was obtained by sequentially photographing by X-ray CT (Computed Tomography) by shifting the cut surface parallel to the first side surface 9 of the winding core 2 from the first side surface 9 to the second side surface 10 by 1 μm. It is a drawing created based on an image. FIG. 4 schematically shows the arrangement of the first wire 4 and the second wire 5 observed on the cut surface IV so close to the first side surface 9 that the ridge line 11 portion is captured in the X-ray CT image. There is.

As shown in FIG. 4, the first wire 4 and the second wire 5 are in contact with each other adjacent to each other, but the central conductors 4a and 5a of the first wire 4 and the second wire 5 are in contact with each other. Due to the presence of the coatings 4b and 5b made of electrically insulating resin, those adjacent to each other are not in contact with each other.

As shown in FIGS. 3 and 4, the first ridge line 11 between the top surface 7 and the first side surface 9 of the winding core 2, the second ridge line 12 between the second side surface 10 and the top surface 7, and the first On each of the third ridge line 13 between the side surface 9 and the bottom surface 8 and the fourth ridge line 14 between the bottom surface 8 and the second side surface 10, the first wire 4 and the second wire 5 extend in the directions of the ridge lines 11 to 14. It is in a state of being lined up with. Then, in the first ridge line 11, the second ridge line 12, the third ridge line 13, and the fourth ridge line 14, each of the first wire 4 and the second wire 5 in the same turn, more accurately, the first wire 4 and the first wire 4. Each of the electrically insulating coatings of the two wires 5 is in close contact with each ridge line. In addition, close contact means that the first wire or the second wire comes into contact with each other on the ridgeline. This state can also be confirmed from FIG. 5, which will be described later.

At this time, as shown in FIG. 4, it is preferable that the distance between the first wire 4 and the second wire 5 is constant. As a result, the electrical balance between the first wire 4 and the second wire 5 can be improved. Further, when the outer peripheral surfaces of the first wire 4 and the second wire 5, that is, the electrically insulating coatings of the first wire 4 and the second wire 5 are in close contact with each other, the insulating coating is formed. Since the central conductors of the first wire 4 and the second wire 5 can be more reliably separated from each other by the electrically insulating resin, the electrical balance can be improved.

In FIG. 5, the twisted state of the first wire 4 and the second wire 5 is schematically in a state where the peripheral surface of the winding core 2 is developed in the order of the first side surface 9, the top surface 7, the second side surface 10, and the bottom surface 8. It is shown in. In FIG. 5, the first wire 4 is shown by a thick line and the second wire 5 is shown by a double line. Further, among the first wire 4 and the second wire 5, those located above each other at the intersections are shown by solid lines, and those located below are shown by broken lines.

As described above with reference to FIG. 11, assuming that the twist number 1 is a state in which the first wire 4 and the second wire 5 are twisted 360 degrees and the length thereof is a twist pitch, the first side surface 9 in FIG. Above, since the first wire 4 and the second wire 5 are twisted 180 degrees, the number of twists is 0.5 and the twist pitch is 0.5. Further, on the first side surface 9, when viewed from the outside of the peripheral surface of the winding core 2 toward the central axis CA of the winding core 2, the antinodes at the twisted portions of the first wire 4 and the second wire 5 are the first. 1 Located on each of the ridges 13 and 11 located at opposite ends of the side surface 9 in the circumferential direction, the first wire 4 and the second wire 5 are aligned in the extending directions of the ridges 13 and 11, respectively. It is in close contact with each of the ridge lines 13 and 11. One node in the twisted portion of the first wire 4 and the second wire 5 appears near the midpoint in the circumferential direction of the first side surface 9.

Next, on the top surface 7, the number of twists of the first wire 4 and the second wire 5 is 1. The antinodes of the twisted portions of the first wire 4 and the second wire 5 are located above the ridges 11 and 12, which are located at opposite ends of the top surface 7 in the circumferential direction, respectively, and the first wire 4 and the second wire 2 The wires 5 are arranged in the extending directions of the ridge lines 11 and 12, and are in close contact with each of the ridge lines 11 and 12. Another antinode in the twisted portion of the first wire 4 and the second wire 5 appears near the midpoint in the circumferential direction of the top surface 7. The knots in the twisted portion of the first wire 4 and the second wire 5 appear at two locations, one at which the top surface 7 is approximately 1/4 of the circumferential dimension and the other at which it is approximately 3/4.

The first wire 4 and the second wire 5 do not always have the above-described form, and the number of twists on any surface depends on the number of twists per turn and the length of the surface in the circumferential direction of the winding core. Can be other than a multiple of 0.5.

Next, on the second side surface 10, the number of twists of the first wire 4 and the second wire 5 is 0.5. The antinodes of the twisted portions of the first wire 4 and the second wire 5 are located on the ridges 12 and 14, respectively located at opposite ends of the second side surface 10 in the circumferential direction, and the first wire 4 and the first wire 5 are located. The 2 wires 5 are arranged in the extending directions of the ridge lines 12 and 14, and are in close contact with each of the ridge lines 12 and 14. One node in the twisted portion of the first wire 4 and the second wire 5 appears near the midpoint in the circumferential direction of the second side surface 10.

Next, on the bottom surface 8, the number of twists of the first wire 4 and the second wire 5 is 1. The antinodes of the twisted portions of the first wire 4 and the second wire 5 are located above the ridges 14 and 13, respectively located at opposite ends of the bottom surface 8 in the circumferential direction, and the first wire 4 and the second wire 5 is arranged in the extending direction of each of the ridge lines 14 and 13, and is in close contact with each of the ridge lines 14 and 13. Another antinode in the twisted portion of the first wire 4 and the second wire 5 appears near the midpoint in the circumferential direction of the bottom surface 8. The knots in the twisted portion of the first wire 4 and the second wire 5 appear in two places, one is about 1/4 of the circumferential dimension of the bottom surface 8 and the other is about 3/4.

After that, the same twist is repeated a predetermined number of times.

As described above, when the first wire 4 and the second wire 5 are in close contact with each of the first ridge line 11, the second ridge line 12, the third ridge line 13, and the fourth ridge line 14, the winding core 2 It stabilizes the wound and twisted states of the first wire 4 and the second wire 5 above, and thus contributes to the stabilization of the electrical characteristics of the coil component 1. By repeating this a predetermined number of times, it is further electrically stabilized.

Further, since the antinode of the twisted portion is positioned by the ridges 11 to 14 of the winding core 2, it is possible to reduce the unevenness of the positions of the nodes and the antinode of the twisted portion, and thus the first wire 4 and the second wire 5 The electrical balance between them can be improved. Therefore, it is possible to reduce the difference between the stray capacitance formed in relation to the first wire 4 and the stray capacitance formed in relation to the second wire 5, and the signal passing through the first wire 4 and the second wire 5, respectively. The inductance and capacitance affected by the can be equal to or nearly equal to each other, and in the case of a common mode choke coil, the mode conversion characteristic can be reduced.

Further, the dimensions of the top surface 7, the bottom surface 8, the first side surface 9, and the second side surface 10 constituting the peripheral surface of the winding core 2 in the circumferential direction are twist pitch × 0.5, twist pitch × 1, respectively. It is a multiple of "twist pitch x 0.5", such as twist pitch x 0.5 and twist pitch x 1. Further, the total dimension of the winding core 2 in the circumferential direction is also a multiple of "twist pitch x 0.5".

Further, as can be seen from FIGS. 1 to 4, the dimensions of the top surface 7 and the bottom surface 8 measured in the circumferential direction of the winding core 2 are the first side surface 9 and the second side surface also measured in the circumferential direction of the winding core 2. It is twice the size of each of 10. That is, each dimension of the top surface 7 and the bottom surface 8 measured in the circumferential direction of the winding core 2 is an integral multiple of each dimension of the first side surface 9 and the second side surface 10 measured in the circumferential direction of the winding core 2. Here, of the four dimensions such as the top surface 7, the bottom surface 8, the first side surface 9, and the second side surface 10 measured in the circumferential direction of the winding core 2, each of the first side surface 9 and the second side surface 10 Is the shortest dimension. In this case, the dimensions of the top surface 7, the bottom surface 8, the first side surface 9, and the second side surface 10 measured in the circumferential direction of the winding core 2 are all the shortest dimensions, that is, the first side surface 9 and the second side surface. It is an integral multiple of each dimension of 10.

According to such a configuration, it is possible to obtain a state in which the first wire 4 and the second wire 5 are in close contact with each of the ridge lines 11 to 14 while the twist pitch is fixed, so that the mass productivity is excellent. be able to.

The twist direction at the twist portion of the first wire 4 and the second wire 5 may be the direction opposite to the direction shown in the drawing, or the twist direction when passing through each of the ridge lines 11 to 14. May be reversed so that the two twist directions coexist. Further, in FIGS. 1 to 3, the twisted first wire 4 and the second wire 5 are shown in close contact with each other, but the first wire 4 and the second wire 5 are one between each other. It may be twisted in a state where a partial gap is formed. Even if the first wire 4 and the second wire 5 are in close contact with each other, as described above, the central conductors of the wires 4 and 5 are covered with an electrically insulating resin, so that the distance between the central conductors is a certain amount or more. There is an interval of.

In the first reference example described above, for example, regarding the first ridge line 11 at one end of the top surface 7 of the winding core 2, the first ridge line is used in a plurality of turns of the first wire 4 and the second wire 5. Since the first wire 4 and the second wire 5 are in contact with the 11 at the same time, the number of times the first wire 4 comes into close contact with the first ridge line 11 and the number of times the second wire 5 comes into close contact with each other are substantially equal to each other.

Here, since there are places where the first wire 4 and the second wire 5 are separated from each other, such as the winding start portion and the winding end portion of the first wire 4 and the second wire 5, the ridge line 11 described above is the first. The number of times the 1 wire 4 is in close contact with the number of times the second wire 5 is in close contact is not always equal. Therefore, there may be a difference of about two turns in these times.

Further, even between the winding start portion and the winding end portion of the first wire 4 and the second wire 5, the number of times the first wire 4 comes into close contact with the ridge line 11 and the number of times the second wire 5 comes into close contact with each other are not always equal. Not exclusively.

Further, in the first reference example , the twisted portions of the first wire 4 and the second wire 5 for a plurality of turns are adjacent to each other on the top surface 7, the bottom surface 8, the first side surface 9 and the second side surface 10 of the winding core 2. Of the ridge lines 11 to 14 located between the objects, the first wire 4 and the second wire 5 are brought into close contact with two ridge lines that are line-symmetrical to each other and face each other, for example, ridge lines 11 and 12. Similarly, the first wire 4 and the second wire 5 are provided on the two ridges 12 and 14, the two ridges 14 and 13, and the two ridges 13 and 11, which are line-symmetrical to each other and face each other. Both are in close contact.

Therefore, the number of the first wire 4 and the number of the second wire 5 in close contact with the ridge line 11 are equal to each other. Similarly, the number of first wires 4 and the number of second wires 5 in close contact with the ridge line 12 are equal to each other. Similarly, the number of first wires 4 and the number of second wires 5 in close contact with the ridge line 14 are equal to each other. Similarly, the number of the first wire 4 and the number of the second wire 5 in close contact with the ridge line 13 are equal to each other.

Further, of the two ridge lines 11 and 12 that are line-symmetrical to each other and face each other, the number of the first wires 4 that are in close contact with one ridge line 11 and the number of first wires 4 that are in close contact with the other ridge line 12 are Equal to each other. Further, the number of the second wires 5 in close contact with one ridge line 11 and the number of the second wires 5 in close contact with the other ridge line 12 are equal to each other. Similarly, of the two ridges 12 and 14 that are line-symmetrical to each other and face each other, the number of first wires 4 that are in close contact with one ridge 12 and the number of first wires 4 that are in close contact with the other ridge 14. Are equal to each other. Further, the number of the second wires 5 in close contact with one ridge line 12 and the number of the second wires 5 in close contact with the other ridge line 14 are equal to each other. Similarly, of the two ridges 14 and 13 that are line-symmetrical to each other and face each other, the number of first wires 4 that are in close contact with one ridge 14 and the number of first wires 4 that are in close contact with the other ridge 13. Are equal to each other. Further, the number of the second wires 5 in close contact with one ridge line 14 and the number of the second wires 5 in close contact with the other ridge line 13 are equal to each other. Similarly, of the two ridges 13 and 11 that are line-symmetrical to each other and face each other, the number of first wires 4 that are in close contact with one ridge 13 and the number of first wires 4 that are in close contact with the other ridge 11. Are equal to each other. Further, the number of the second wires 5 in close contact with one ridge line 13 and the number of the second wires 5 in close contact with the other ridge line 11 are equal to each other.

However, in some of the above configurations, the number of first wires 4 and the number of second wires 5 that are considered to be equal to each other do not necessarily have to be equal, and may differ by, for example, about two turns.

Further, in the first reference example , for example, regarding the first ridge line 11 at one end of the top surface 7 of the winding core 2 and the second ridge line 12 at the other end, the twist located on the top surface 7 The portion had the first wire 4 and the second wire 5 in close contact with both the first ridge line 11 and the second ridge line 12, but the twisted portion in such a state was present in at least one turn. Just do it.

Further, in the first reference example , the first wire 4 and the second wire 5 are in close contact with each of the first ridge line 11, the second ridge line 12, the third ridge line 13 and the fourth ridge line 14 for a plurality of adjacent turns. It was in a state of doing. As described above, as the number of ridge lines in which the first wire 4 and the second wire 5 are in close contact with each other increases, the stability of the wound state and the twisted state can be further improved. The first wire 4 and the second wire 5 may be in close contact with each other only on one of the first ridge line 11, the second ridge line 12, the third ridge line 13, and the fourth ridge line 14.

Further, in the above-described reference example , for a plurality of adjacent turns, the first wire 4 and the second wire are provided only on one of the first ridge line 11, the second ridge line 12, the third ridge line 13 and the fourth ridge line 14. Although it is assumed that 5 may be in close contact with each other, for at least one turn, for example, only for one turn, of the first ridge line 11, the second ridge line 12, the third ridge line 13, and the fourth ridge line 14. The first wire 4 and the second wire 5 may be in close contact with each other only on one of the ridgelines.

The number of turns in which the first wire 4 and the second wire 5 are in close contact with at least one of the first ridge line 11, the second ridge line 12, the third ridge line 13, and the fourth ridge line 14 is larger. Is preferable. For example, if the state of close contact with the ridgeline is realized in 4 or more turns out of the 5 turns of the wound 1st wire 4 and 2nd wire 5, the mode conversion characteristic in the common mode choke coil is stabilized. Can be done. Further, it is more preferable that the state of close contact with the ridge line is realized in 5 turns or more of the 6 turns of the wound first wire 4 and the second wire 5.

In the first reference example described above, the peripheral surfaces of the winding core 2 are four planes arranged in the circumferential direction in a state of being adjacent to each other, that is, the top surface 7, the bottom surface 8, the first side surface 9, and the second side surface. The cross-sectional shape of the winding core 2 along the plane orthogonal to the central axis CA of the winding core 2 is a quadrangle having each side extending linearly. However, it is also possible to adopt the modified examples as shown in FIGS. 6 to 8 below. In FIGS. 6 and 7, the elements corresponding to the elements shown in FIG. 3 are designated by the same reference numerals, and duplicate description will be omitted.

In the winding core 2a shown in FIG. 6, the cross-sectional shape along the plane orthogonal to the central axis CA is hexagonal. The six sides that make up this hexagon are the same length as each other. Explaining the difference from the winding core 2 shown in FIG. 3 by using the reference reference numerals used in the winding core 2 shown in FIG. 3, the cross-sectional shape of the top surface 7 and the cross-sectional shape of the bottom surface 8 are both outward. It has a bent shape that overhangs.

According to this modification, it is possible to give a degree of freedom in changing the aspect ratio of the cross-sectional shape of the winding core 2a as compared with the winding core 2 having a quadrangular cross section shown in FIG. For example, as compared with the winding core 2 shown in FIG. 3, the cross-sectional area can be increased and the inductance can be improved without changing the dimension in the height direction so much. Further, the internal angles formed by the ridges of the peripheral surfaces of the quadrangular winding core 2 shown in FIG. 3 are approximately 90 degrees, respectively, but the peripheral surface of the winding core 2a having a hexagonal cross section shown in FIG. The internal angles formed by the ridges are all obtuse angles exceeding 90 degrees. Therefore, the degree of protrusion of the angle formed by the ridge line on the peripheral surface of the winding core 2a can be made dull as compared with the winding core 2 having a quadrangular cross section shown in FIG. 3, and the damage to the wire can be reduced. Can be done.

In the winding core 2b shown in FIG. 7, the cross-sectional shape corresponding to the cross-sectional shape of the winding core 2 shown in FIG. 3 is a pentagon. Explaining the difference from the winding core 2 shown in FIG. 3 by using the reference reference numerals used in the winding core 2 shown in FIG. 3, the cross-sectional shape of the top surface 7 is a bent shape protruding outward. There is.

In this modification , the dimension of the bottom surface 8 is not an integral multiple of the dimensions of the top surface 7 and the dimensions of the side surfaces 9 and 10 with respect to the dimensions measured in the circumferential direction of the winding core 2b. However, the stability of the wound and twisted states of the first and second wires can be improved because the antinodes at the twisted portion can be positioned on any ridgeline in at least one turn. In order to obtain a state in which the first wire and the second wire are lined up on all the ridgelines, the twist pitch is set on the winding on the bottom surface 8 and on each of the top surface 7 and the side surfaces 9 and 10. It is necessary to change with the winding of. That is, in order to realize a state in which the first wire and the second wire are lined up on the ridge line, the positional relationship between the twist state and the ridge line affects, so the twist pitch is not always constant over the entire circumference of the winding core. No.

In order to avoid the above-mentioned troublesomeness, the cross-sectional shape of the winding core 2b may be a regular pentagon.

In the winding core 2c shown in FIG. 8, the peripheral surface formed around the central axis has one plane 22 extending in the direction along the central axis. The first ridge line 23 extending in the direction along the central axis is located at the first end portion in the circumferential direction of the plane 22, and at the second end portion opposite to the first end portion in the circumferential direction of the plane 22. The second ridge line 24 extending in the direction along the central axis is located.

Although not shown, the twisted portions of the first wire and the second wire are wound around the winding core 2c described above over a plurality of turns. At this time, the twisted portion of the plurality of turns located on the plane 22 may be in a state in which the first wire and the second wire are in close contact with each other only on either the first ridge line 23 or the second ridge line 24. In this way, the stability of the wound state and the twisted state of the first wire and the second wire can be improved. For more stabilization in the wound and twisted states, the first and second wires are lined up on both the first ridge 23 and the second ridge 24 in the extending directions of the ridges 23 and 24, respectively. It is preferable to position it.

9 and 10 are for explaining the first and second embodiments of the present invention, respectively, and correspond to an enlarged view of the left half of the cross-sectional view shown in FIG. In FIGS. 9 and 10, the elements corresponding to the elements shown in FIG. 3 are designated by the same reference numerals, and duplicate description will be omitted.

The first and second embodiments are both characterized by chamfering in the form of ridge lines of the winding core 2 there is, this feature may be employed in reference example described above. Note that, in FIGS. 9 and 10, only the first ridge line 11 and the third ridge line 13 are shown, and the second ridge line 12 and the fourth ridge line 14 are not shown, but the forms of the second ridge line 12 and the fourth ridge line 14 are shown. Is symmetrical with the morphology of the first ridge line 11 and the third ridge line 13. Hereinafter, the first ridge line 11 and the third ridge line 13 will be described, and the description of the second ridge line 12 and the fourth ridge line 14 will be omitted.

With reference to FIG. 9, the ridges 11 and 13 of the winding core 2 are chamfered to provide reliefs 25 and 26, respectively. As a result, two convex portions 27 and 28 are formed on the portion of the ridge line 11, and two convex portions 29 and 30 are formed on the portion of the ridge line 13. When the wires 4 and 5 are wound around the core 2, the wires 4 and 5 are formed on at least one of the protrusions 27 and 28 at the portion of the ridge 11 and the protrusions 29 and 30 at the portion of the ridge 13. Be sure to stick to at least one side. Normally, when the wires 4 and 5 are wound counterclockwise, the wires 4 and 5 always tend to be in close contact with the convex portion 27 at the portion of the ridgeline 11 and the convex portion 29 at the portion of the ridgeline 13. When the wires 4 and 5 are wound clockwise, the wires 4 and 5 always tend to be in close contact with the convex portion 28 at the portion of the ridge 11 and the convex portion 30 at the portion of the ridge 13.

As described above, even if the ridges 11 and 13 are provided with reliefs 25 and 26, respectively, the wires 4 and 5 will always be in close contact with each other at some part of the ridges 11 and 13.

Next, with reference to FIG. 10, the ridges 11 and 13 of the winding core 2 are chamfered so that the slopes 31 and 32 are attached to the corners, respectively. As a result, two convex portions 33 and 34 are formed on the portion of the ridge line 11, and two convex portions 35 and 36 are formed on the portion of the ridge line 13. When the wires 4 and 5 are wound around the core 2, the wires 4 and 5 are formed of at least one of the protrusions 33 and 34 at the portion of the ridge 11 and the protrusions 35 and 36 at the portion of the ridge 13. Be sure to stick to at least one side. Normally, when the wires 4 and 5 are wound counterclockwise, the wires 4 and 5 always tend to be in close contact with the convex portion 33 at the portion of the ridgeline 11 and the convex portion 35 at the portion of the ridgeline 13. When the wires 4 and 5 are wound clockwise, the wires 4 and 5 always tend to be in close contact with the convex portion 34 at the portion of the ridge 11 and the convex portion 36 at the portion of the ridge 13.

As described above, in the case of the embodiment shown in FIG. 10, even if the ridge lines 11 and 13 are provided with the slopes 31 and 32, respectively, the wires 4 and 5 are the same as in the case of the embodiment shown in FIG. Will always be in close contact somewhere on the ridges 11 and 13.

Although the present invention has been described above in relation to some reference examples and embodiments showing the present invention, various other modifications are possible within the scope of the present invention.

For example, in FIGS. 1 to 5, the twisted portions of the first wire 4 and the second wire 5 are wound in one layer on the winding core 2, but may be wound in two or more layers. When two or more layers are wound, it is sufficient that at least the first layer in contact with the winding core 2 satisfies the above-mentioned conditions.

Further, although the above-mentioned reference examples and embodiments relate to coil parts constituting a common mode choke coil, the present invention can be applied to other coil parts constituting a transformer, a balun, or the like. .. Further, in the above-mentioned reference examples and embodiments, two wires are twisted together, such as the first wire and the second wire, but the number of wires may be three or more.

In addition, each reference example and each embodiment described above are exemplary, and partial replacement or combination of configurations is possible between different reference examples or embodiments.

1 Coil parts 2, 2a, 2b, 2c Winding core 4 1st wire 5 2nd wire 7 Top surface (flat surface)
8 Bottom (flat surface)
9 First side surface (plane)
10 Second side surface (plane)
11-14,23,24 Ridge 22 plane
25,26 escape
27-30, 33-36 Convex part
31,32 Slope CA center axis

Claims (10)

It is the central axis peripheral surface around the formation, wherein the circumferential surface is the extending in a direction along the center line and consists of at least four planes are arranged in a circumferential direction in a state adjacent to each other, around the central axis in the plane At the first end in the circumferential direction, which is the direction, the first ridge line extending in the direction along the central axis is located, and the winding core and
A first wire and a second wire, which are wound around the central axis of the winding core in the same direction and spirally for a plurality of turns to form a twisted portion in a twisted state over a plurality of turns.
With
The portion of the first ridge is chamfered to form two protrusions.
The twisted portion located on the plane has both the first wire and the second wire in close contact with at least one of the two convex portions on the portion of the first ridgeline for one turn.
Coil parts. The coil component according to claim 1, wherein the twisted portion located on the plane has the first wire and the second wire in close contact with the first ridge line for a plurality of adjacent turns. The coil component according to claim 2, wherein the number of times the first wire is brought into close contact with the first ridge line and the number of times the second wire is brought into close contact with each other are substantially equal to each other. In the winding core, a second ridge line extending in a direction along the central axis is located at a second end portion opposite to the first end portion in the circumferential direction of the plane, and a portion of the second ridge line. Is chamfered, thereby forming two protrusions, the twist portion located on the plane of the two protrusions on the portion of the first ridge for a turn. The coil according to any one of claims 1 to 3, wherein the first wire and the second wire are both in close contact with at least one of them and at least one of the two convex portions on the portion of the second ridgeline. parts. The twisted portion located on the plane has the first wire and the second wire in close contact with both the first ridge line and the second ridge line for a plurality of adjacent turns, according to claim 4. Described coil parts. The number of the first wires in close contact with the first ridge line and the number of the second wires are substantially equal to each other, and the number of the first wires in close contact with the second ridge line and the number of the second wires are substantially equal to each other. The coil component according to claim 5, which is equal. The number of the first wires in close contact with the first ridge line and the number of the first wires in close contact with the second ridge line are substantially equal to each other, and the number of the second wires in close contact with the first ridge line and the second wire The coil component according to any one of claims 4 to 6, wherein the number of the second wires in close contact with the ridge line is substantially equal to each other. The coil component according to any one of claims 1 to 7, wherein the peripheral surfaces of the winding core are formed of six planes arranged in the circumferential direction in a state of being adjacent to each other. The coil component according to any one of claims 1 to 8, wherein the dimension of each plane measured in the circumferential direction of the winding core is an integral multiple of the shortest dimension of the dimensions of each plane. The twisted portion is according to any one of claims 1 to 9 , wherein the first wire and the second wire are in close contact with the ridge line at a portion other than the winding start portion and the winding end portion with respect to the winding core. Described coil parts.

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